JP3766689B2 - Pre-humidified, disposable biodegradable wet wipes that can be run in water - Google Patents

Description

例３：ウェットワイプのローション組成物
以下のローション溶液が好ましい。
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メチル パラベン ・・・・・ ０．２０％
プロピル パラベン ・・・・・ ０．０３％
炭酸水素ナトリウム ・・・・・ ６．００％
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ストサイドＡ ・・・・・ ０．１％
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ココアムホジアセテート・・・・・ ０．２５％
ポリソルベート２０ ・・・・・ ０．２０％
メチル パラベン ・・・・・ ０．２０％
プロピル パラベン ・・・・・ ０．０３％
炭酸水素ナトリウム ・・・・・ ６．００％
ホウ酸 ・・・・・ ０．７０％
ストサイドＡ ・・・・・ ０．１％ FIELD OF THE INVENTION The present invention relates to a pre-humidity cleaning wet wipe for daily care that can be reliably and safely used and processed by flowing through a toilet bowl.
BACKGROUND OF THE INVENTION Pre-humidified skin cleansing tissues are also well known commercially and are referred to as wet wipes and paper towels. These tissues need only be made from paper that has been treated to improve moisture strength, ie paper products. Such a tissue is generally sized to be effective for use as a wash towel and may be packaged in a closed container. Otherwise, the tissues may be individually packaged.
Wet wipe tissues are generally treated with a hydroalcoholic solution to retain moisture. The tissue may contain surface active detergents, humectants, and fragrances or fragrances.
Many wet wipe-like materials have been disclosed. U.S. Pat. No. 3,808,165 discloses a method for producing wet wipes in which boric acid is added to polyvinyl alcohol (PVOH) rather than adding boric acid to the lotion at a later time. Yes. The web is dried and this heat of drying breaks down the organic acids present and raises the pH to stabilize the binder. Sodium bicarbonate is not used to raise the pH.
U.S. Pat. No. 3,881,210 discloses a sanitary wiper comprising a PVOH center layer wherein the composite layer structure is adapted to be bonded together by an embossing roll with a land area of 4 to 25%. . However, no stabilizing compounding agents, proportions, or strength criteria are specified.
U.S. Pat. No. 4,309,469 describes a wipe bonded with a three-part adhesive binder composed of PVOH, a self-crosslinked thermoplastic polymer and a non-self-crosslinked thermoplastic polymer. The complexing agents are alpha hydroxy and 0-aromatic hydroxy acids rather than boric acid and sodium hydrocarbon.
U.S. Pat. No. 4,343,133 discloses a paper towel impregnated with polyvinyl acetate latex using a high proportion, at least 3% boric acid, which is too coarse for many applications. Become. This paper towel does not contain sodium bicarbonate.
U.S. Pat. No. 5,256,417 discloses a water dispersible paper towel impregnated with a non-aqueous lotion formulation. Non-aqueous lotion compositions made of organic compounds stabilize the PVOH binder but do not dissolve PVOH.
U.S. Pat. No. 3,689,314 uses a different method to produce a wrapping paper that can be poured into the absorbent pad water. Both PVOH binder and chemically added are added and dried. The chemicals react with heat, making the binder sufficiently strong in the usage situation. The environment of the absorbent pad is a very small area that becomes saturated at low levels when exposed to body fluids. Exposure time is limited to several hours, not monthly. In addition, heating is required to effect crosslinking after the sodium borate is formed. In addition, less than 0.5% sodium bicarbonate is used.
The main problem with these many existing tissues that use a binder system that can be washed in water containing boric acid is that high doses of boric acid cause toxic skin irritation, especially for people with damaged skin. It is to become. Accordingly, there is a need to provide a mild lotion system that contains low concentrations of boric acid. Furthermore, all wet wipes currently on the market have an acidic pH. The most common pH range is 4.0 to 5.5. The pH of the skin is about 5.5 for adults and infants and is the pH most manufacturers attempt to achieve when developing a balanced product.
U.S. Pat. No. 5,252,332 discloses a pre-moist, water-flowable paper towel impregnated with a binder containing polyvinyl alcohol. A PVOH based binder is applied to a nonwoven web to which a lotion comprising boric acid and sodium bicarbonate is applied. The range of sodium bicarbonate is stated to be 0.2 to 3%. In addition, paper towels contain undesirably high amounts of boric acid. The ratio of sodium borate to sodium bicarbonate is 4: 1 to 1: 4, preferably 2: 1 to 1: 2. Furthermore, papa towels are susceptible to the growth of microorganisms, particularly mold, and are not suitable for long-term storage. In contrast, Applicant's invention has a ratio of sodium borate to sodium bicarbonate of 1: 8.5 to 1:12, providing much better wet strength.
Applicant's invention provides a number of features that were desired in the prior art but could not be found. First, Applicants' invention provides an unexpectedly higher wettability that is not available with other formulations that require a similar need. Second, it provides a high proportion of sodium bicarbonate, enhances cleaning and deodorizing effects, and provides alkaline PH suitable for infants and toddlers. Finally, Applicants' invention is surprisingly compatible with the existing Baby Fresh® lotion system, synergistically flowing in water, dispersible and biodegradable soft Can produce cleaning wipes that are effective and effective. Applicant's invention provides for the first time a lotionized wet wipe having an alkaline pH, a high wet strength, a low boric acid concentration that provides softness, and a preservative system that can be stored for long periods of time. Furthermore, Applicant's invention surprisingly provides a wet wipe that provides softness and touch as well, while providing alkaline pH.
The present invention provides a pre-humidity cleaning wet wipe for daily care consisting of a binder comprising PVOH in contact with an aqueous solution containing boric acid and bicarbonate ions. Paper towels have favorable wet tensile strength, but exhibit rapid degradability in water. This material is used as a water-dispersible, biodegradable, wet wipe for infants, children, adolescents and adults of both ages for both sexes. Applicant's wet wipes can be treated reliably by flowing safely in the toilet bowl. The product is compatible with aerobic and non-aerobic biodegradation present in sewers and infectious systems. Applicants' invention further includes a relaxed binder and lotion system that can disperse wet wipes into very small fiber components under conditions of the volume and speed of the water being processed.
SUMMARY OF THE INVENTION The present invention relates to a pre-wettable, dispersible biodegradable wet wipe consisting of nonwoven web fibers in contact with a binder comprising PVOH. The binder can be either polyvinyl alcohol, a polymer emulsion stabilized with aqueous polyvinyl alcohol, a mixture of polyvinyl alcohol or aqueous polymer emulsion, or a combination thereof. The binder contact web further comprises an aqueous lotion solution consisting of from about 0.1 to about 0.9 weight percent boric acid and from about 5 to about 8 weight percent alkali metal bicarbonate, based on the weight of the lotion. Including. The resulting wet wipe has a pH of about 7 to about 9, and a wet strength of about 8 to about 20 ounces / inch.
The present invention relates to a prehumid, dispersible biodegradable wet wipe consisting of a nonwoven fibrous web in contact with a binder comprising PVOH. The binder can be either polyvinyl alcohol, an aqueous polyvinyl alcohol stabilized polymer emulsion, a mixture of polyvinyl alcohol or an aqueous polymer emulsion, or a combination thereof. Wet wipes contain from about 0.3 to about 0.7% by weight boric acid and from about 6 to about 7% by weight sodium bicarbonate, based on the weight of the lotion, and also propylene glycol, cocoa mph diacetate (Cocoamphpodiacetate) ), Polysorbate 20, methyl paraben, propyl paraben and stride A (Suttocide). The resulting wet wipe has a pH of about 7 to about 9 and a wet strength of about 12 to about 16 ounces / inch.
[Brief description of the drawings]
FIG. 1 represents the value of machine cross direction lotion strength (CDLT) versus time over a month at room temperature for a wet wipe consisting of lotion composition 1-12 having various boric acid / sodium bicarbonate concentrations. The lotion composition is shown in Table 1.
FIG. 2 represents the value of lotion strength (CDLT) over time for one week at 52 ° C. for a wet wipe consisting of lotion composition 1-12 having various boric acid / sodium bicarbonate concentrations. The lotion composition is shown in Table 1.
FIG. 3 represents the values of lotion strength (CDLT) over time for one week at room temperature for a wet wipe consisting of lotion composition 13-20 having various boric acid / sodium bicarbonate concentrations. The lotion composition is as follows (% boric acid /% sodium bicarbonate): 13 = 0.99% / 5.5%; 14 = 0.99% / 6.5%; 15 = 0.66% / 5.5%; 16 = 0.66% / 6.5 %; 17 = 0.33% / 5.5%; 18 = 0.33% / 6.5%; 19 = 0.11% / 5.5%; 20 = 0.11% / 6.5%.
Detailed description of preferred embodiments The present invention relates to a non-woven wet wipe product that is safe to use, flows in water in a suitable environment, disperses, and finally biodegrades. This material is used as a water-dispersible, dispersible, biodegradable wet wipe for all ages of boys and girls, infants, adolescents and adults. Although the wet wipe of the present invention has an alkaline pH, it retains its softness and softness and can be used for children and infants.
As used herein, “wet wipe” means a nonwoven fibrous web that can be used for cleaning purposes. Wet wipes are also called paper towels.
As used herein, “dispersible” means breaking a wet wipe in water or another liquid solution.
As used herein, “wt%” refers to the amount by weight of the compound in the wet wipe lotion as a weight percentage of the lotion.
In its basic form, the wet wipes of the present invention are combined with a PVOH system and lotioned with a non-irritating formulation containing relatively low levels of boric acid and moderate levels of sodium bicarbonate. Made of woven fiber material. Wet wipes are composed primarily of cellulose wood pulp fibers with an additional amount of spun fibers to increase wet and dry strength. Preferably, the wood pulp fibers comprise from about 75% to about 95% by weight of the wet wipes, and the spun fibers comprise from about 5% to about 25% of the wet wipes. Wood pulp fibers are more preferred because they are about 85% to about 90% by weight of the wet wipes and spun fibers are about 10 to about 15% of the wet wipes. Preferred spun fibers preferably include rayon, cotton, wool, acetate or tencel fibers.
Those skilled in the art will readily have the knowledge necessary to create a fibrous web that can be used as a wet wipe. One skilled in the non-woven materials art will readily appreciate that fibrous webs can be formed by carding, wet deposition, spunbonding, and meltblowing. Furthermore, these methods can be combined to achieve unique results. A homogeneous dry deposition structure as desired provides the most preferred and economical variation in this application.
The wet wipe nonwoven web is preferably formed by dry deposition, so that not all fibers are laminated, but eventually mixed to achieve a high degree of mixing homogeneity and specific volume. It has become. The dry web is compressed and can be embossed with a pattern. Embossing can produce wet wipe products with various words, such as pictures such as animals, doll shapes, and the like. The dry deposition web is sprayed on both sides with PVOH binder to provide a low level of solid impregnation of about 2% to about 20%. Preferably, an impregnation amount of about 5% to about 10% is provided. The binder is generally a premixed 30% solid solution, which can be diluted to a 10% solution and can be applied to a moisture absorption of about 100% if diluted to a 10% solution. Can be obtained.
The web is air dried and wound on a roll. The web is split, folded, pre-humidified with lotion, cut and overlaid on the tabs. Lotion saturation is from about 100% to about 350% saturation. Lotion saturation is preferably from about 250% to about 350% saturation. The basis weight (dry weight) of the web is about 70 grams / square meter. The wet thickness of the product is about 20 to about 25 mils (1 mil = 1/1000 inch). Current wet wipe products include Kid Fresh and Sofkin.
The binder comprising PVOH of the present invention comprises PVOH, an aqueous PVOH stabilized emulsion, a mixture of PVOH and an aqueous polymer emulsion, or a combination thereof. A preferred binder is an Air Products A-911 PVOH binder.
The lotion formulation will produce a low level of boric acid, light lotion, preferably about 0.1 to about 0.9% by weight based on the weight of the water, preferably the lotion, preferably based on the weight of the lotion. About 5 to about 8% by weight of a moderate level of alkali metal bicarbonate. The lotion preferably comprises from about 0.3 to about 0.7 wt% boric acid and from about 6 to about 7 wt% alkali metal bicarbonate based on the weight of the lotion. The alkali metal bicarbonate is preferably sodium bicarbonate. Boric acid and alkali metal bicarbonate are preferably mixed in the lotion solution rather than in the binder mixture.
The lotion formulation may also include a preservative system. Currently available antiseptic systems are designed for acidic wet wipes. Thus, an alkaline lotion formulation that includes an antiseptic system provides several advantages including protection against microorganisms and long-term storage. The preservative preferably forms a bactericidal agent comprising an antibacterial active agent, antifungal active agent or anti-yeast fungus or a combination thereof. It is also preferred that the preservative provides the wet wipes of the present invention with the ability to be stored for as long as 3 years. Preferred preservatives are formaldehyde and formaldehyde donors, glutaraldehyde, No. 4-15, imidazolidinyl and diazolidinyl urea parabens, chloroxylenol, chlorothymol, triclosan, propamidine, isethionate, dibromopropamide, hexaminidin, isethionate, zinc pyrithione, Oxazine A, kason, alkyltrimethylammonium, bromide, benzalkonium chloride, benzodium chloride, piroctone olamine, gluceral, monolaurate or combinations thereof. Preservatives may generally be included at about 0.01 to about 1.5% by weight based on the lotion.
Lotion formulations may also contain moisturizing or softening agents, surfactants or emulsifiers, and fragrances. Preferred humectants and emulsifiers include polyols, proteins, plant derivatives, and aqueous barrier generating materials such as, for example, lanolin, fatty acids, alcohols, or the like. Moisturizers and emulsifiers generally comprise from about 0.1 to about 10.0% by weight based on the weight of the lotion. Preferred surfactants and emulsifiers are primary alkyl sulfates / aliphatic sulfate alkyl ethers, aliphatic monoglyceride sulfates, fatty acid peptide condensates / aliphatic sarcosine acid condensates / sulfosuccinates, polyglycosides, phospholipids, linear sulfonic acids Including alkylates and amphoteric compounds or combinations thereof. Surfactants and emulsifiers comprise from about 0.1 to about 10.0% by weight based on the weight of the lotion. Perfumes include those currently available in the market that are chemically compatible with lotion formulations. The perfume generally comprises from about 0.01 to about 2.0% by weight based on the weight of the lotion. A preferred lotion is a baby fresh base lotion. For use with infants and toddlers, the pH of the lotion system is preferably from about 7 to about 9.
In order for each individual to use a wet wipe without disassembly in the hand, the wet wipe of the present invention must have sufficient wet strength. The wet strength of a wet wipe can be approximated by a known CDLT strength test as described in Example 2. The wet strength of the wet wipe is preferably tested in a one week, January and March ripening test. Patentable wet wipes retain their wet strength past room temperature and 50 ° C. After aging at room temperature and 50 ° C., the wet wipes preferably retain a significant cross machine strength of 8 to 20 ounces / inch. More preferably, the wet wipe retains a cross machine wet strength of 12 to 16 ounces / inch. A general wet wipe CDLT test is represented herein in Example 3.
Once the proper size is reached, the wet wipes can be flushed in a normal household toilet. The wet wipe of the present invention is easily decomposed by stirring with a large volume of water. In order to analyze the decomposability, which is a measurement of flowing in water, a sag decomposition test is preferable. A dispersion time of less than 3 minutes is preferred. A dispersion time of less than 2 minutes is more preferred.
The wet wipes of the present invention are preferably biodegradable. The wet wipe may be weak so that it can be used for human use without causing an allergic reaction or another similar phenomenon. Wet wipes preferably go through a repeated excrement patch test (RIPT) and another toxicity test. The wet wipes of the present invention are not toxic to humans.
It is surprising to find an overall lotion system that meets the desire for a balance between mild and strength and retains the ability to be distributed. The present invention provides an alkaline wet wipe that includes a low level of boric acid and a relatively high level of sodium bicarbonate, and includes a moderate lotion system that maintains strength and dispersibility. This combination of properties is highly desirable.
Examples Example 1: Slack Break Test The slack break test can be used to determine the time required to break a single wet wipe product. Generally, a stir bar is placed in a beaker filled to a depth of 6 inches with water or a buffer of appropriate pH. A beaker is placed on the magnetic stirrer and the speed is adjusted as desired. The solution is adjusted to the desired test temperature. A sample of wet wipes for testing is preferably 8 inches long and 1/8 inch in diameter, with an edge that is bent into a piece (about 1/4 inch is bent at a 110 ° angle). Wrapped around a steel rod. The sample preferably does not extend beyond the bent end of the rod. The solution is stirred at a constant speed and the rod is placed in a clamp attached to a ring stand. A rod is placed on the beaker at an intermediate point between the center and the edge of the beaker. The sample is gently lowered into the solution until completely immersed. Any size piece is first broken from the wet wipe and the time is measured until the sample breaks freely from the steel rod.
Example 2: CDLT Test The wet strength of various concentrations of boric acid and sodium bicarbonate wet wipes were tested at room temperature by CDLT and the results are presented in Table 1. The CDLT of the sample wet wipe is preferably tested according to the manufacturer's instructions with a suitable device such as a Chewing-Albert Intellect II STD device. Test procedures for determining the dry tencel strength of sample wet wipes are known to those skilled in the art. Five sample strips are arranged in a quadrilateral in the upper clamp of the Tencel strength device. The clamp is closed, one of the strips descending from the top clamp is separated and its free end is placed on the bottom clamp. A very slight tensile force is applied to remove sagging and actuate the bottom clamp. The test is then started according to the manufacturer's instructions. After the test strip breaks, the test sequence is repeated for the four remaining sample strips. Five sample strips are tested for wet tencel strength. The two ends of the sample strip are placed together, forming a loop in the center. The broken loop portion of the sample is placed in either diluted water to test a non-lotioned wet wipe or a beaker containing a lotion to test a lotioned wet wipe. The wet central loop of the sample gently touches the towel to remove excess water or lotion, and then the sample is inserted into the grip of the device. A dry tencel intensity sequence is then performed. As can be seen from Table 1, sufficient CDLT can be obtained at very low levels of boric acid. 1 and 2 show the CDLT values for Solution 1-12 over 1 month at room temperature (21 ° C.) and 52 ° C., respectively. Furthermore, the change in boric acid with respect to bicarbonate is shown in FIG. In addition, Table 2 represents wet strength values for wet wipes having various lotion compositions after 1 week at room temperature. As can be seen, considerable strength can be achieved with a wet wipe when the concentration of sodium bicarbonate is high, with the wet wipe having a boric acid lotion concentration as low as 0.33%.

Example 3 : Wet wipe lotion composition The following lotion solutions are preferred.
0.5% solution water ... 91.22%
Propylene glycol ... 1.50%
Cocoa diacetate 0.25%
Polysorbate 20: 0.20%
Methyl paraben 0.20%
Propylparaben: 0.03%
Sodium hydrogen carbonate: 6.00%
Boric acid: 0.50%
Structosite A ... 0.2%
0.6% solution water ... 91.12%
Propylene glycol ... 1.50%
Cocoa diacetate 0.25%
Polysorbate 20: 0.20%
Methyl paraben 0.20%
Propylparaben: 0.03%
Sodium hydrogen carbonate 6.00%
Boric acid: 0.60%
Stride A: 0.1%
0.7% solution water ... 91.02%
Propylene glycol ... 1.50%
Cocoa diacetate 0.25%
Polysorbate 20: 0.20%
Methyl paraben 0.20%
Propylparaben: 0.03%
Sodium hydrogen carbonate 6.00%
Boric acid: 0.70%
Stride A: 0.1%

Claims (10)

a) a nonwoven fiber web and a binder selected from the group consisting of polyvinyl alcohol, a polymer emulsion stabilized with aqueous polyvinyl alcohol, a mixture of polyvinyl alcohol and an aqueous polymer emulsion, and combinations thereof;
b) an aqueous lotion composed of 0.1 to 0.9% by weight boric acid and 5 to 8% by weight alkali metal bicarbonate, and a preservative effective to prevent microbial activity in the lotion; A pre-humid, dispersible biodegradable wet wipe, wherein the ratio of boric acid to bicarbonate is 1: 8.5 to 1:12,
c) A wet wipe characterized in that the wet wipe has a pH of 7 to 9 and a wet strength of about 0.224 to about 0.56 kg / 2.54 cm (8 to 20 ounces / inch). The wet wipe of claim 1, wherein the range of the amount of the aqueous lotion solution is 100 to 350% by weight based on the weight of the web. The wet wipe of claim 1, wherein the boric acid is 0.3 to 0.7% by weight of the lotion. The wet wipe of claim 1, wherein the alkali metal bicarbonate is 6 to 7 wt% based on the weight of the lotion. The boric acid is 0.3-0.7 wt% based on the weight of the lotion and the alkali metal bicarbonate is 6-7 wt% based on the weight of the solution. The wet wipe as described in. 6. The wet wipe of claim 5, wherein the wet wipe has a wet strength of from about 0.336 to about 0.448 Kg / 2.54 cm (12 to 16 ounces / inch). The wet wipe according to claim 1, wherein the alkali metal bicarbonate is sodium hydrogen carbonate. The wet wipe according to claim 1, wherein the aqueous lotion solution further contains a humectant and a surfactant. The wet wipe according to claim 8, wherein the aqueous solution further contains a fragrance. a) a nonwoven fiber web and a binder selected from the group consisting of polyvinyl alcohol, a polymer emulsion stabilized with aqueous polyvinyl alcohol, a mixture of polyvinyl alcohol and an aqueous polymer emulsion, and combinations thereof;
b) an aqueous lotion consisting of 0.3 to 0.7% by weight boric acid and 6 to 7% by weight sodium bicarbonate, the ratio of boric acid to bicarbonate being 1: 8.5 to 1:12. And
c) the lotion comprises propylene glycol, cocoamphodiacetate, polysorbate 20, methyl paraben, propyl paraben and formaldehyde effective to prevent microbial activity of the lotion , And formaldehyde donor, glutaraldehyde, 4-15, imidazolidinyl and diazolidinyl urea, paraben, chloroxylenol, chlorothymol, triclosan, propamidine isethionate, dibromopropamide, hexaminidine, isethionate, zinc pyrithione, oxazine A, kason, alkyltrimethyl A preservative comprising ammonium bromide, benzalkonium chloride, benzodium chloride, piroctone olamine, glyceryl monolaurate or combinations thereof ; A pre-humid, dispersible biodegradable wet wipe intended to contain,
d) A wet wipe characterized in that the wet wipe has a pH of 7 to 9 and a wet strength of 0.224 to 0.56 kg / 2,54 cm (8 to 20 ounces / inch).

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